Keep source directory around, even though it is empty atm
javadoc
set-version is fixed in tycho 0.19.0
set-version is fixed in tycho 0.19.0... but it messes up manifest formatting, so revert to 0.17.0

This reverts commit 3475419865325efd645c0782f531fda5b14f2b5e.
Use 0.0.0 in site category.xml to refer to latest version